@henteko/kumiki/dist/generators/subtitle/webvtt.js

A video generation tool that creates videos from JSON configurations

export class WebVTTFormatter {
    formatTime(seconds) {
        const hours = Math.floor(seconds / 3600);
        const minutes = Math.floor((seconds % 3600) / 60);
        const secs = Math.floor(seconds % 60);
        const milliseconds = Math.floor((seconds % 1) * 1000);
        const pad = (n, width) => n.toString().padStart(width, '0');
        if (hours > 0) {
            return `${pad(hours, 2)}:${pad(minutes, 2)}:${pad(secs, 2)}.${pad(milliseconds, 3)}`;
        }
        return `${pad(minutes, 2)}:${pad(secs, 2)}.${pad(milliseconds, 3)}`;
    }
    formatCue(cue) {
        const startTime = this.formatTime(cue.startTime);
        const endTime = this.formatTime(cue.endTime);
        return `${startTime} --> ${endTime}\n${cue.text}`;
    }
    format(cues) {
        const header = 'WEBVTT\n';
        const formattedCues = cues.map(cue => this.formatCue(cue)).join('\n\n');
        return `${header}\n${formattedCues}\n`;
    }
}
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